The cap of Amanita colombiana may be free of volval
remnants, but it usually bears easily broken, crushed, or
removed volval warts that are red at first, and then
become gray. The discoloring volva suggests a
realtionship with the Old World species A. ceciliae (Berk. &
Broome) Bas; however, A. colombiana is the only known species
of the "ceciliae group" that has a red
volva. The cap is 20 - 55 mm wide, with the center
somewhat depressed at maturity, and with a strongly
striate margin; it is dull olivaceous, brownish gray or
olivaceous grayish brown.

gills

The gills are free, subdistant, white in mass, not noticeably discoloring,
and 4 - 6 mm broad, gray-marginate at maturity; the short
gills are truncate, of varying length, and numerous.

stem

The stem is 75 - 80 × 5 - 6 mm>, predominantly white, and
exannulate, with patches of the easily breakable volva at
the base. The volva on the stipe is colored like that on
the cap and becomes sordid with age also.

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accession

locus

voucher

source

holotypes

HUA

intro

The following text may make multiple use of each data field.

The field may contain magenta text presenting data from a type study
and/or revision of other original material cited in the protolog of the present taxon.
Macroscopic descriptions in magenta are a combination of data from the protolog and
additional observations made on the exiccata during revision of the cited original
material.

The same field may also contain black text, which is data from a revision of the present
taxon (including non-type material and/or material not cited in the protolog).
Paragraphs of black text will be labeled if further subdivision of
this text is appropriate.

Olive text indicates a specimen that has not been
thoroughly examined (for example, for microscopic details) and marks other places in the text
where data is missing or uncertain.

The following material not directly from the protolog of the present taxon and not cited as the work of another researcher is based on original research by R. E. Tulloss.

free, close to subdistant at maturity, white, not discoloring, drying close to 4A4 to a little more cream than 4A4 to 5B4, 4 - 6 mm broad, rarely forking near pileus margin; edge grayish marginate when mature, very finely fimbriate (with 10× lens); lamellulae numerous, not in regular tiers, truncate.

The coloring of the universal veil in A. colombiana is unique among the species described in section Vaginatae. Red spots are said to appear on the universal veil of A. constricta Thiers & Ammirati (1982) in moist conditions; and that species (described from northern California) does have plentiful vascular hyphae in the pileus context; but A. constricta has a more nearly submembranous universal veil that is mostly grayish and spores with Q = (1.06 ) 1.07 - 1.17 ( 1.18) according to type studies of Tulloss (1994).

citations

—R. E. Tulloss

editors

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